Crossovers - changes where frequencies go (send lows through subwoofer, etc.)

SPEAKERS:
Tweeter
Woofer
Sub woofer

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MIXER VIDEO NOTES

FOH/Mains send audio to house.
48V phantom power.
Parametric vs. graphic EQ. see other notes.
Direct box = correct impedance
3 ways to get rid of noise out of mixer - EQ, check headroom with PFL, cut/pass low or high frequencies, put everything into same plug/circuit, change three-prong plug through two-prong plug (gets rid of ground)
gain/trim - pot.
don't run XLR and power cord RIGHT next to each other. if you MUST, go perpendicular. not parallel.